just putting a decat and exhaust system on my misses stock gt made quite alot of difference, sits at 9psi on full chat and then drops a tad at high revs (stock actuator) next mod is the mani, although cant see how its ganna make it slower, i can understand there being slightly more lag with the uprated mani as ive noticed that before on my old gtir and evo 3,usually because the runners have a longer run and have a larger internal dia than the stock mani. you will prob notice it pulls better at high revs though